PRTN3 and rheumatoid arthritis: Analysis was performed to evaluate correlation between anti–cit-CRT Abs in RA patient sera and the levels of ACPA, CRP, erythrocyte sedimentation rate (ESR), rheumatoid factor (RF), visual analog scale of pain (VAS), tender/swollen joints, and disease activity score (DAS) 28 score at baseline (Fig. 5E).